fermentation

/ˌfɜː(ɹ)mənˈteɪʃən/

IPA: /F ER0 M AH0 N T EY1 SH AH0 N/

noun
  1. 1

    Any of many anaerobic biochemical reactions in which an enzyme (or several enzymes produced by a microorganism) catalyses the conversion of one substance into another; especially the conversion (using yeast) of sugars to alcohol or acetic acid with the evolution of carbon dioxide

  2. 2

    A state of agitation or excitement; a ferment.

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Source: https://en.wiktionary.org/wiki/fermentation